Path MTU Discovery
Configuring Path MTU Discovery on Outgoing TCP Connections
By default, path MTU discovery on outgoing TCP
connections is enabled. To disable path MTU discovery, include the no-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
[edit system internet-options] no-path-mtu-discovery;
To reenable path MTU discovery on outgoing TCP
connections, include the path-mtu-discovery statement at
the [edit system internet-options] hierarchy level:
[edit system internet-options] path-mtu-discovery;
Configuring IP-IP Path MTU Discovery on IP-IP Tunnel Connections
By default, path maximum transmission unit (MTU) discovery on outgoing IP-IP tunnel connections is enabled.
To disable IP-IP path MTU discovery, include the no-ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
[edit system internet-options] no-ipip-path-mtu-discovery;
To reenable IP-IP path MTU discovery, include the ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy
level:
[edit system internet-options] ipip-path-mtu-discovery;
Configuring Path MTU Discovery on Outgoing GRE Tunnel Connections
By default, path MTU discovery on outgoing GRE
tunnel connections is enabled. To disable GRE path MTU discovery,
include the no-gre-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:
[edit system internet-options] no-gre-path-mtu-discovery;
To re-enable GRE path MTU discovery, include the gre-path-mtu-discovery statement at the [edit system internet-options] hierarchy
level:
[edit system internet-options] gre-path-mtu-discovery;
To verify details of the path MTU on outgoing GRE tunnels,
use the command show interfaces (GRE).